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Operation of High and Low Voltage Complete Sets of Equipment

The operation scheme for high and low voltage equipment involves structured procedures for installation, commissioning, operation, maintenance, and risk management to ensure safe, reliable, and efficient power distribution.Overview of High and Low Voltage Equipment

High Voltage (HV) equipment typically operates at 11 kV and above and includes switchgear, ring main units (RMUs), and transformers. Its primary functions are power control, protection, and isolation, allowing safe maintenance and rapid fault clearance in the electrical network . HV switchgear often uses circuit breakers with insulating mediums like sulfur hexafluoride (SF6) for fast and safe interruption of current . Low Voltage (LV) equipment operates at 230–400 V and includes main switchboards (MSB), sub-switchboards (SSB), distribution boards (DB), feeder pillars, and tap-off units. LV systems distribute power to end-users and ensure operational safety through protective devices and proper isolation .

Technical Management Framework

The operation scheme relies on a comprehensive technical management framework covering:

  • Design and Manufacturing Standards: Compliance with international standards (IEC 61439) and national standards (GB 7251) ensures electrical performance, mechanical robustness, insulation, and material quality .
  • Installation and Commissioning: Includes unboxing, inspection, foundation checks, assembly, and functional testing to prevent failures and ensure operational readiness .
  • Fault Analysis and Risk Prevention: Techniques like Failure Mode and Effects Analysis (FMEA), fuzzy comprehensive evaluation, and intelligent monitoring systems detect potential failures and prevent equipment damage .
  • Maintenance and Monitoring: Scheduled preventive maintenance, calibration of protection devices, power quality analysis, and monitoring of operational parameters ensure reliability and efficiency .
Operational Procedures

The standard operating procedures (SOPs) for HV and LV systems include:

  1. Preparation and Approval: The operating company prepares SOPs for approval by the governing authority (e.g., Ministry of Health in hospital settings) to ensure compliance with regulations .
  2. System Operation: Continuous monitoring and operation of HV and LV equipment, including switchgear, transformers, and distribution boards, to maintain uninterrupted power supply .
  3. Maintenance: Regular servicing, including switchgear inspection every two years, cleaning of plant rooms, and updating logbooks. Power quality checks (voltage, current, frequency, harmonics) are performed annually, and power factor is maintained above 0.85 .
  4. Safety and Compliance: Ensuring all electrical rooms are locked, permits to work are issued, and visiting engineers follow statutory requirements. Operational parameters are recorded and uploaded to monitoring systems .
Risk Management and Monitoring
  • Intelligent Monitoring: Partial discharge detection and digital twin technologies allow real-time monitoring and predictive maintenance .
  • Preventive Measures: Arc fault prevention, corrosion protection, and current-limiting devices reduce the risk of equipment failure .
  • Documentation: Maintaining detailed records, including Hospital Specific Implementation Plans (HSIP), log sheets, and technical advice reports, ensures traceability and accountability .
Responsibilities
  • Government/Authority: Approves SOPs, ensures compliance, provides oversight, and verifies maintenance and operational standards .
  • Operating Company: Implements SOPs, maintains equipment, provides technical advice, ensures power availability, and complies with manpower and safety requirements .
Conclusion

The operation scheme for high and low voltage complete sets of equipment integrates design standards, installation protocols, operational procedures, preventive maintenance, and risk management. Following these structured procedures ensures safe, stable, and efficient operation of power distribution systems while minimizing downtime and hazards .

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